Public bug reported:
I suspect this to be a bug related to mutter, but I'm not sure.
On Ubuntu 18.04 using either Nouveau or NVIDIA's driver (from Ubuntu's
"Additional Drivers" utility), when I select and apply a higher
available refresh rate for my monitor (e.g: 240hz), the change is only
applied to mouse movements, whereas if I drag applications' windows
around I can clearly see their movement is still at the default 60hz.
Linux Mint 19 with either the Cinnamon or MATE DE does *not* show this
issue.
** Affects: mutter (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1782399
Title:
Specified monitor refresh rate is applied to mouse cursor only and not
the applications' windows on 18.04 with Nouveau or NVIDIA's driver
from Ubuntu's repo
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